package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {//不能用@Autowired，因为这个类是new出来的，不是spring管理的
        this.stringRedisTemplate = stringRedisTemplate;
    }
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求头中的token
        String token = request.getHeader("authorization");
        //不存在
        if(StrUtil.isBlank(token)){
            return true;
        }
        //存在，获取用户信息
        //String s = LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(token);//不可以直接将 stringRedisTemplate.opsForHash().entries(token) 替换为 stringRedisTemplate.opsForHash().get()
        // 3.判断用户是否存在
        if (userMap.isEmpty()) {
            // 4.不存在，拦截，返回401
            return true;
        }
        UserDTO  userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);//将map转为对象
        //存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //5.刷新token有效期
        stringRedisTemplate.expire(token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
